Product features 1. supports quad bands, i.E. 850/900/1800/1900mhz, universal in the world. 2. wide input voltage: 6-36v dc. 3. supports single positioning and feedbacks position via gprs at setting times. 4. supports vehicle positioning and tracking. 5. supports acc status checking and vehicle status notifying. 6. use relay to remote control the vehicle. 7. use sos button for sos call. 8. use external mic to monitor remotely. Specification Voltage 12vdc/24vdc Standby current